diff --git a/lib/front/front.class.php b/lib/front/front.class.php
index 2d68563605..a2026338ac 100644
--- a/lib/front/front.class.php
+++ b/lib/front/front.class.php
@@ -57,6 +57,7 @@ class html extends baseHTML
     {
         $id = "id='$name'";
         if(strpos($attrib, 'id=') !== false) $id = '';
+        if(is_null($value)) $value = '';
         $value = str_replace("'", ''', $value);
         $autocomplete = $autocomplete ? 'autocomplete="on"' : 'autocomplete="off"';
         return "<input type='text' name='$name' {$id} value='$value' $attrib $autocomplete />\n";